Drinking Water: A Groundwater Modeling Study in Newmarket, NH CAW - - PowerPoint PPT Presentation

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Drinking Water: A Groundwater Modeling Study in Newmarket, NH CAW - - PowerPoint PPT Presentation

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Sea-Level Rise Impacts on Drinking Water: A Groundwater Modeling Study in Newmarket, NH CAW Workshop April 26, 2018 5:00pm Hugh Gregg Coastal Conservation Center Research investigation or experimentation aimed at the discovery and

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SLIDE 1

Sea-Level Rise Impacts on Drinking Water:

CAW Workshop

April 26, 2018 5:00pm Hugh Gregg Coastal Conservation Center

A Groundwater Modeling Study in Newmarket, NH

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SLIDE 2

Research – “investigation or experimentation aimed at the discovery and interpretation of facts, revision of accepted theories or laws in the light of new facts, or practical application of such new or revised theories or laws”

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Planning – “the act or process of making or carrying out plans”

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SLIDE 3

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Existing model… …different application

Introduction

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SLIDE 4

Groundwater Rise with Sea-Level Rise Scenarios

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SLIDE 5

Project Goals

  • Increase the understanding of how sea-level rise

may impact groundwater sources of drinking water

  • Identify areas of T
  • wn that may be vulnerable to

groundwater rise due to sea-level rise

  • Provide the T
  • wn with suggested adaptation

strategies to assist in becoming more resilient

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SLIDE 6

Process

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T echnical Planning Committee Meeting #1 – 6/23/16

Data Collection Model Construction Model Scenarios Analysis & Mapping Final Report & Recommendations Final Presentation

May-June June-Oct Nov-Jan Jan-Mar Mar-May June 2016 2017

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T echnical Planning Committee Meeting #2 – 3/9/17 T echnical Planning Committee Meeting #3 – 5/5/17

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SLIDE 7

Outcomes

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  • Groundwater Rise
  • Vulnerable Infrastructure and Potential

Contamination Sites

  • Saltwater Intrusion
  • Septic System Environmental Impacts
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SLIDE 8

Groundwater Rise Highlights

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  • Ranges from

1 to 7ft to

  • ccur within

0.8 miles of the coast

  • Moody Point

is projected to experience the most rise

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SLIDE 9

Vulnerable Infrastructure and Potential Contamination Sites

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  • Moody Point (3

wells)

  • Two potential

contamination sites

  • One sewer pump

station (M. Point)

  • 30 private drinking

water wells

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SLIDE 10

Saltwater Intrusion

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  • Moody Point already

experiences high total dissolved salt (TDS) levels

  • The two deeper wells are

experiencing higher salt concentrations

  • Closer to groundwater

table are more susceptible to intrusion

  • Model predicts an 8-12%

increase in salinity concentrations

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SLIDE 11

Septic System Environmental Impacts

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  • Limitations for septic tank

leach fields

  • Wetlands, floodplains, and

100ft buffer around surface waters

  • Determine where septic tanks

and leach fields are more vulnerable to groundwater rise

  • Can be used as a preliminary

guide (additional information is needed)

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SLIDE 12

Recommendations

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  • Adaptation strategies, timeframe, and potential

partners/programs and additional needs

  • Six planning topics:

1.

Outreach and Engagement

2.

Planning/Regulatory

3.

Long-term drinking water

4.

Infrastructure & equipment

5.

Additional research

6.

Emergency management

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SLIDE 13

Accomplishments & Next Steps

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  • Data was included in the 2018 multi-hazard

mitigation plan update

  • Newmarket is considering expanding municipal

water infrastructure to Moody Point development

  • Durham, in partnership with SRPC will be seeking

funding to do a similar analysis

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SLIDE 14

Thank You!

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Kyle Pimental, Principal Regional Planner Strafford Regional Planning Commission 150 Wakefield Street, Suite 12 Rochester, NH 03867 603.994.3500 kpimental@strafford.org www.strafford.org